Re: [gentoo-user] webcam on Gentoo Logitech C270

[Joseph <syscon780@gmail.com>]

On 12/21/14 22:08, Alexander Kapshuk wrote:
>   grep '^CONFIG.*V4L' /usr/src/linux/.config
>   CONFIG_VIDEO_V4L2=m
>   CONFIG_V4L_PLATFORM_DRIVERS=y
>   CONFIG_MEDIA_SUPPORT=m
>   CONFIG_USB_VIDEO_CLASS=m
>   CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV=y
>   CONFIG_USB_GSPCA=m
>   CONFIG_MEDIA_PCI_SUPPORT=y
>   grep -s ^LD_PRELOAD .*
>   .bash_profile:LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so
>   Also, you may want to try plugging you webcam into a USB2 port, if
>   available, instead of a USB3 one, as suggested here,
>   [6]http://linux-kernel.2935.n7.nabble.com/3-15-8-USB-issue-with-uvc-cam
>   -td920378.html.
>   Hope this helps.

When I try to run: guvcview

I get:
guvcview 1.6.1
ALSA lib /var/tmp/portage/media-libs/alsa-lib-1.0.28/work/alsa-lib-1.0.28/src/pcm/pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib /var/tmp/portage/media-libs/alsa-lib-1.0.28/work/alsa-lib-1.0.28/src/pcm/pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib /var/tmp/portage/media-libs/alsa-lib-1.0.28/work/alsa-lib-1.0.28/src/pcm/pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib /var/tmp/portage/media-libs/alsa-lib-1.0.28/work/alsa-lib-1.0.28/src/pcm/pcm_route.c:947:(find_matching_chmap) Found no matching channel map
video device: /dev/video0 
ERROR opening V4L2 interface for /dev/video0
unable to detect video devices on your system (0)
ERROR opening V4L interface: Permission denied
Init video returned -1
VIDIOC_REQBUFS - Failed to delete buffers: Inappropriate ioctl for device (errno 25)
cleaned allocations - 100%
Closing portaudio ...OK

-- 
Joseph